Xcode 如何轻松设置NSImage的动画？

我在NSImage中创建了一个NSView，我希望通过NSNotificationCenter发送开始和停止通知来设置该NSView的动画

我要走哪条路才能实现这一点

我的密码是：

@implementation SyncToolbarItemView

- (id)init
{
    self = [super initWithFrame:CGRectMake(0.0f, 0.0f, 32.0f, 32.0f)];
    if (self)
    {
        // Initialization code here.
    
        // Add observers
        [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(startSyncing) name:NOTIFICATION_START_CHECK_TAG_PROCESS object:nil];
        [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(stopSyncing) name:NOTIFICATION_FINISHED_CHECK_TAG_PROCESS object:nil];
    }

    return self;
}

- (void)drawRect:(NSRect)dirtyRect
{
    // Init image
    img_sync = [[NSImageView alloc] initWithFrame:NSMakeRect(0.0f, 0.0f, 32.0f, 32.0f)];
    [img_sync setImage:[NSImage imageNamed:@"icon_sync.png"]];

    // Add to view
    [self addSubview:img_sync];

    [img_sync release];
}

- (void) startSyncing
{

}

- (void) stopSyncing
{

}

@end

---

您应该看看CoreAnimation参考，它非常清楚地说明了如何为NSImageView等控件设置动画